to signpost London with an arrow
用箭头标明伦敦的方向

Use chalk to signpost directions to hidden stores.
使用粉笔指示消费者到隐秘的商店？

Please go through the staff only channel. There is the signpost.
请走员工通道, 那儿有标识牌。

To Baekeland and others aiming to find commercial opportunities in the nascent electrical industry, that gunk was a signpost pointing toward something great.
但贝克兰和其他在刚起步的电力工业中寻求商机的人认为，这个黏糊糊的东西将导致某种伟大的发现。